How can I use pytest to test asynchronous code?

How can I use pytest to test asynchronous code?

You can use the pytest-asyncio plugin to test async code with pytest. It allows you to write async test functions.

Can you show me a simple example of an async test?

Sure! Here's a basic example:

import pytest
import asyncio

async def async_function():
    await asyncio.sleep(1)
    return 42

@pytest.mark.asyncio
async def test_async_function():
    result = await async_function()
    assert result == 42

What if I want to test multiple async functions?

You can define multiple async test functions in the same way. Just use the @pytest.mark.asyncio decorator for each one.

Are there any common pitfalls when testing async code?

Yes, one common pitfall is forgetting to use await when calling async functions in your tests, which can lead to unexpected results.